• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4

# Finding out how much acid there is in a solution

Extracts from this document...

Introduction

Plan: Finding out how much acid there is in a solution [Oliver White] Theory During the extraction of a metal from its ore, sulphur dioxide is often produced. This can be converted to sulphuric (IV) acid and sold as a useful by-product. With a given sample of the acid solution, with concentration thought to be between 0.05 and 0.15 mol dm-3, I am asked to accurately find its concentration. I am provided with solid anhydrous sodium carbonate and the indicators; methyl orange and phenolphthalein. Screened methyl orange is also available for people who are colour blind and have difficulties noticing colour changes when using the methyl orange. The choice for my experiment is only between methyl orange and phenolphthalein as I have no trouble using the methyl orange. To help choose which indicator would be most suitable we are given details about the solubility of indicators for different types of titration; Strong Acid Weak Acid Hydrochloric acid Ethanoic acid Nitric acid Ethanedioic acid Sulphuric acid Strong Alkali Weak Alkali Sodium hydroxide Ammonia solution Potassium hydroxide Sodium carbonate Calcium hydroxide Sodium hydrogencarbonate For a titration between a strong acid and a weak alkali, methyl orange is used as the indicator. ...read more.

Middle

= 12 3 x O (16) = 48 = 106 Now I want to make a 250cm3 solution at 0.1 mol. Having worked out the relative molecular mass of sodium carbonate I know that I need 106g of Na2CO3 to make one mole of solution in 1dm3. But as I only want 0.1 mol dm-3 I would only need 10.6g. Even now this is too much Na2CO3 as we are using 0.25dm3(250cm3) not 1dm3(1000cm3) so finally we need to divide 10.6 by 4 to give us 2.65g of Na2CO3 which is correct for 250cm3. Apparatus: -Stand -Clamp -Pipette -Pipette Filler -Burette -Volumetric Flask -Digital Balance -Wash Bottle -Glass Rod -Beaker -Conical Flask -White Tile Diagram of apparatus and lay-out of results table Figure 1: diagram of apparatus and table for results Method To begin with I will weigh out as accurately as I can 2.65g of anhydrous sodium carbonate into a weighing bottle and will then transfer this into a large beaker to make the solution. I will rinse the remains in weighing the bottle into the beaker so I ensure all the sodium carbonate gets transferred. ...read more.

Conclusion

The titration must be stopped as soon as the methyl orange turns a pink/peachy colour. The titration must be repeated until you achieve concordant results within 0.1cm3 of each other. Safety Precautions Anhydrous Sodium Carbonate; Is an irritant to the eyes and respiratory system and the dust must not be breathed in. In case of contact with eyes, they must be rinsed immediately with plenty of water and medical advice must be sought. Exposure to the dust must be minimized.1 Sulphuric Acid; Extremely corrosive and causes serious burns. It is highly toxic and harmful by inhalation, ingestion and through skin contact. Ingestion may be fatal. Skin contact can lead to extensive and severe burns. Chronic exposure may result in lung damage and possibly cancer. Safety glasses or a face mask must be worn. Acid resistant gloves should be worn and there must be suitable ventilation because the vapour mustn't be inhaled.2 You must be stood up and the safety goggles must be kept on at all times during the experiment. Long hair must be tied back. Spillages must be cleaned up immediately and broken glass must be safely disposed of in the 'broken glass' waste bin. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Organic Chemistry section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Organic Chemistry essays

1. ## The aim of this experiment is to produce Aspirin. This is an estrification in ...

Standard solutions can be chemically reacted with a solution of unknown concentration in order to determine the concentration of the unknown The acetylsalicylic acid and NaOH react in a 1:1 ratio. The NaOH solution was made to a concentration of 500cm3 0.1 mol dm-3.

2. ## investigating the amount of ascorbic acid present in fruit

Once a permanent colour has been reached (a colour of dark blue - black), this is when you have reached endpoint. This colour change also shows that vitamin C was present in the fruit sample. 19. Record the approximate value of the volume of NBS solution needed to reach end point in the investigation.

1. ## Comprehensive and Detailed Chemistry notes

bezoyl peroxide is used Steps in the process are: -- Heated benzoyl peroxide splits to form free-radicals -- These react with ethylene double bond as initiators. Activated monomer radical forms. -- The monomer radicals combine with new ethylene monomers building up the chain -- Chain growth terminates when free-radicals combine

2. ## Compare the enthalpy changes of combustion of different alcohols

This happens when there is equal chance of something going wrong during the experiment. This type of error is countered by repeating the experiment. Other points that contribute to prove precision and reliability: * Using a draught excluder will direct the heat from the spirit burner onto the calorimeter and prevent any excess heat reaching the atmosphere.

1. ## coursework plan for halogenalkanes

The carbon atom is less electronegative then the halogen atoms so the electrons in the bond are more nearer to the halogen. The carbon atom will now have a partial positive charge known as ?+ (delta plus) and the halogen atom will have a partial negative charge known as ?- (delta minus).

2. ## Finding the concentration of an acid sample

Below is a comparison of some major Indicators: indicator pKind pH range litmus 6.5 5 - 8 methyl orange 3.7 3.1 - 4.4 phenolphthalein 9.3 8.3 - 10.0 As you can see the only one in range is the Methyl Orange Sodium Carbonate Because I will need a 250cm3 sodium carbonate solution.

1. ## analysing the unknown compound A

Reaction with universal indictor "Universal Indicator is a pH indicator that has different colours to indicate the pH range of the solution it's in" said by http://en.wikipedia.org/wiki/Universal_indicator. It is a good indicator because of the fact it has a varied range of colour for different pH's which is useful as

2. ## Determine the Concentration of Limewater Solution

Concentration of Hydrochloric Acid needed following dilution: I will now work out the concentration of the hydrochloric acid needed to be the diluted value using the above information: I have already been given the original concentration of the Hydrochloric acid which is 2.00 mol dm-3.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to